▶️ Answer/Explanation
Transpiration is the process of water vapor loss from the internal tissues of a plant to the external atmosphere, primarily through the stomata. This movement is driven by a water potential gradient between the moist interior of the leaf and the drier air outside. When the percentage humidity in the air is low ($0\%$), the air is dry, creating a steep concentration gradient that causes water to evaporate rapidly. As humidity increases towards $100\%$, the air becomes saturated with water vapor, significantly reducing the gradient and slowing down the rate of evaporation. Therefore, the rate of transpiration is inversely proportional to the humidity of the surrounding air, which is correctly illustrated by the downward curve in Graph B.
✅ Answer: (B)
✅ Answer: (B)
